Is this vulnerability remotely exploitable?

Yes, in cloud environments where an attacker (or compromised identity) has the necessary AWS API permissions. The attacker does not require network-level access to the training infrastructure itself, only the ability to call relevant AWS APIs and write to the S3 output location.

What level of access does an attacker need to exploit this?

The attacker must have at least two capabilities: 1. Permission to call `DescribeTrainingJob` (typically via `sagemaker:DescribeTrainingJob`) to obtain the cleartext ModelBuilder HMAC key. 2. Permission to modify or upload objects in the training job's S3 output location. Without both, exploitation is significantly constrained.

What is the safest general fix pattern?

The safest pattern is to ensure that sensitive keys are never exposed via user-facing or operator-facing APIs and instead remain confined to secure backend components or managed key services. Additionally, separate duties so that identities that can inspect job metadata cannot write to locations whose contents are executed or trusted by those jobs.

Severity:

HIGH RISK

(7.2)

Cleartext Exposure of HMAC Signing Key (CWE-319) in Amazon SageMaker Python SDK ModelBuilder

CVE-2026-1777

Published:

Feb 2, 2026

Status:

Awaiting Analysis

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

NDV

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Account Takeover / Loss of Account Control

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CWE-77;CWE-78

HIGH RISK

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Remote Code Execution on the Server Host

February 17, 2026

Vulnerability Type

Category:

Cleartext Sensitive Information Exposure

CWE:

CWE-319

Impact:

Arbitrary Code Execution via Malicious Training Artifacts

Severity:

HIGH RISK

(7.2)

CVSS Version:

3.1

Vulnerability Type

Category:

Cleartext Sensitive Information Exposure

CWE:

CWE-319

Impact:

Arbitrary Code Execution via Malicious Training Artifacts

Severity:

HIGH RISK

(7.2)

CVSS Version:

3.1

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Made with Love in San Francisco

355 Bryant St. San Francisco, CA 94107, USA

Ask AI for summary of CodeAnt

Cleartext Exposure of HMAC Signing Key (CWE-319) in Amazon SageMaker Python SDK ModelBuilder

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

Recent Vulnerabilities

CRITICAL RISK

CRITICAL

(9.8)

Missing Authentication for Forgot-Password Email Change API (CWE-306)

HIGH RISK

HIGH

(7.3)

OS Command Injection (CWE-78) in node-sonos-http-api TTS Provider for macOS

Vulnerability Type

Vulnerability Type

Vulnerability Type

Vulnerability Type

Catch This CVE While Code Is Being Written

Ship clean & secure code faster

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